[w3c/payment-request] Browser autofill unavailable for payment apps (Issue #1049)

dtjones404 created an issue (w3c/payment-request#1049)

Browser autofill functionality appears to be disabled or non-functional when payment applications are running within Chromium's implementation of the PaymentRequest API payment window. This significantly impacts user experience by preventing users from leveraging saved emails and passwords. Is this an intentional limitation of the spec?  I've attached some screenshots to illustrate this behavior affecting Google Pay, but it appears to be a general issue as it's affecting our app as well.

Google Pay running in a popup window (autofill available):
<img width="506" height="543" alt="Image" src="https://github.com/user-attachments/assets/c1e80108-8502-4083-9f6b-2a20df531b4d" />

Google Pay running in the PaymentRequest browser window (autofill unavailable):
<img width="613" height="600" alt="Image" src="https://github.com/user-attachments/assets/07f39802-a215-46c1-8218-3135b475311b" />



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